说明：  SVPWM的主要思想是以三相对称正弦波电压供电时三相对称电动机定子理想磁链圆为参考标准，以三相逆变器不同开关模式作适当的切换，从而形成PWM波，以所形成的实际磁链矢量来追踪其准确磁链圆。
(The main idea of SVPWM is to take the ideal flux circle of the three-phase symmetrical motor stator as the reference standard when the three-phase symmetrical sine wave voltage is used for power supply, and make proper switch with different switch modes of the three-phase inverter, so as to form PWM wave and track its accurate flux circle with the actual flux vector formed.)